Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks
文献类型：期刊论文
| 作者 | Jia, Zice1,3; Hu, Yu3; Bayon, Germain6; Peckmann, Joern5; Wang, Xudong3; Gong, Shanggui3; Li, Jie4 ; Roberts, Harry H.2; Chen, Duofu1,3; Feng, Dong1,3
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| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
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| 出版日期 | 2024-03-01 |
| 卷号 | 25期号:3页码:14 |
| DOI | 10.1029/2023GC011379 |
| 英文摘要 | Understanding the interaction between molybdenum (Mo) and organic matter during microbial sulfate reduction is critical for the use of Mo to reconstruct marine redox conditions throughout Earth's history. However, little is known about Mo isotope fractionation and how it relates to organic matter remineralization during microbial sulfate reduction. Here, we report Mo abundances and isotopic (delta 98Mo) compositions for bulk-rock, non-lithogenic and sequentially extracted fractions, including carbonate (carb), pyrite, and organic matter (OM), of seep carbonate rocks. Our data indicate that the difference between delta 98Mocarb and delta 98MoOM (Delta 98Mocarb-OM) displays significant variability in the studied samples, ranging between 0.72 and 1.01 parts per thousand. Remarkably, the obtained Delta 98Mocarb-OM values indicate correlative trends with stable carbon isotope ratios and bulk abundances of (a) total organic carbon, (b) Mo, and (c) pyrite in seep carbonates, which we interpret as reflecting sustained adsorption of isotopically light Mo onto organic matter during enhanced sulfate reduction. On this basis, we put forward the concept that Delta 98Mocarb-OM of authigenic carbonate rocks can be used as a measure of the intensity of sulfate reduction and for reconstructing past interactions between Mo and organic matter in marine sediments. Molybdenum (Mo) is a useful element for reconstructing marine redox conditions throughout the Earth's history. The sequestration of Mo through sulfate-reducing bacterial activity acts as a significant pathway for Mo burial in the ocean. However, the impact of microbial sulfate reduction in Mo isotope fractionation remains unclear, preventing the understanding of the interaction between Mo and organic matter. We report Mo abundances and isotopic (delta 98Mo) compositions for different phases extracted from seep carbonate rock fractions, including carbonate (carb), pyrite, and organic matter (OM). Our findings indicate that organic matter tends to preferentially adsorb isotopically light Mo. The observed delta 98Mo difference between carbonate and organic matter fractions (Delta 98Mocarb-OM from 0.72 to 1.01 parts per thousand) represents the first report of the extent of Mo isotope fractionation during Mo adsorption to organic matter in marine environments. We attribute greater Delta 98Mocarb-OM offsets to the preferential adsorption of isotopically light Mo onto organic matter during enhanced sulfate reduction, and in turn put forward the idea that such offsets can be possibly used in the sedimentary record to trace the intensity of sulfate reduction and to reconstruct the past interaction between Mo and organic matter in marine sediments. Organic matter tends to adsorb isotopically light Mo, resulting in low delta 98Mo values of organic matter in marine environments Isotopically light Mo is inferred to be preferentially adsorbed onto organic matter during enhanced sulfate reduction delta 98Mo offset between carbonate and organic phases in authigenic carbonates is promising to trace the past intensity of sulfate reduction |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001186256000001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77333]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Hu, Yu; Feng, Dong |
| 作者单位 | 1.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China 2.Louisiana State Univ, Coastal Studies Inst, Coll Coast & Environm, Baton Rouge, LA USA 3.Shanghai Ocean Univ, Coll Oceanog & Ecol Sci, Shanghai, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 5.Univ Hamburg, Inst Geol, Ctr Earth Syst Res & Sustainabil, Hamburg, Germany 6.Univ Brest, CNRS, Ifremer, Geoocean, Plouzane, France |
| 推荐引用方式 GB/T 7714 | Jia, Zice,Hu, Yu,Bayon, Germain,et al. Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2024,25(3):14. |
| APA | Jia, Zice.,Hu, Yu.,Bayon, Germain.,Peckmann, Joern.,Wang, Xudong.,...&Feng, Dong.(2024).Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,25(3),14. |
| MLA | Jia, Zice,et al."Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 25.3(2024):14. |
入库方式： OAI收割
来源：广州地球化学研究所
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